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Section 4
4.2.3
Probe Electrode Maintenance
Page 52
Probe Maintenance and Poor Probe Output
When the membrane wets (changes color), you may install either side against the
platinum electrode.
2. Unscrew the membrane cap and discard the old membrane. Place the
new, prewetted membrane on top of the platinum electrode where the old
one was removed.
Note: The membranes are white! The paper spacers are blue or brown. DO NOT
install the spacers. When installing, it is best to use clean, blunt tweezers to gently
grasp the membrane at the edges only. This avoids puncturing or soiling the
membrane, either of which will render the probe inoperable.
3. Pull the probe body back from the reservoir until it hits the body screws. At
this point, the platinum tip of the probe should be recessed slightly into
the reservoir.
4. Screw the membrane cap back onto the probe. The membrane should go
on flat and seal against the o-ring at the tip.
5. Turn the probe over so that the tip is pointing down. Then remove the
electrolyte fill screw on the side of the canister. Tap the probe gently to
allow electrolyte to flow down around the new membrane.
6. Tighten the three body screws. The platinum tip should press out into the
new membrane, resulting in a smooth stretching of the membrane across
the tip. Then replace the electrolyte fill screw.
7. Place the probe in distilled water and allow to soak for about two hours.
Then place the probe into the flow cell and let chlorinated water flow for
one hour prior to re-calibrating.
Erratic, slow, or low chlorine readings can be a result of contaminated probe
electrodes. To remove contamination, the electrodes can be cleaned in a
solution of nitric acid. The frequency of this procedure depends on the
application environment. In some applications, probes can operate indefinitely
without ever requiring an electrode cleaning; other applications have required
electrode cleaning every three months. The probe's tip and anode are
identified in the figure below.
16116Maintenance.fm
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